powerpc/perf: Avoid spurious PMU interrupts after idle
POWER9 DD2 can see spurious PMU interrupts after state-loss idle in some conditions. A solution is to save and reload MMCR0 over state-loss idle. Signed-off-by: NNicholas Piggin <npiggin@gmail.com> Acked-by: NMadhavan Srinivasan <maddy@linux.vnet.ibm.com> Tested-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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